Sheet-glass-surfacing table



June 3,1930. .J. c. GlPE 1,761,720

' SHEEWT'MGLASS SURFACING TABLE Fil ed June 24, 192s mum! (Yo/9n C. Gipe.

' AT TUENEY.

INVEN-TEIH- Ill Patented .June 3, 1930 v "UNITED T T S JOHN c. 'GIPE, or TOLEDO, OHIO, ASSIGNORITO LIBBEY-OWENS chess COMPANY, or

PATEN TOLEDO, OHIO, A CORPORATION OF OHIO snEEr-eLAss-sURrAcme ai ABLn Application filed June 24, 1925; Serial No. 39,252.

The present invention relates to sheet-glass surfacing apparatus, and has particular reference to a table adapted to support the sheet during the surfacingoperations."

In the manufacture of'plate glass, ablank is ground and polished upon both sidesto remove any waves or surface distortions so that a clearer, true vision can be had when looking through the said plate. To do this: it is necessary to support the plate glass blank during the surfacing operat ons in amanner that the opposite surfaces of the sheet will, after they havc been ground and polished, be almost'absolutely parallel to each other which means that the sheet must be of a uniform thickness throughout.

It is anaii n of the present invention to provide a table for supporting the sheet during the grinding or: polishing operations in a manner that both sides of the sheet can be ground and polished to produce an absolutely uniform sheet of plate glass. Another object of the invention is to provide a table of this nature wherein the plate glass blank can be freely, supported during the surfacing operations, the said sheet being" placed within a recess formed in the supporting table, and includes a protective pad interposed betweenthe bottom of the recess and the sheet of glass being surfaced.

Still another object of the invention is to provide a plate glass blank supporting table comprising a table having preferably adjustable plates carried thereon which form a recess on said table adapted to contain the sheet of glass during the surfaoin operations, the said recess having a'pa of felt loosely mounted therein so that the sheet'can be freely supported thereon during the grinding and-polishing thereof. Other. objects and advantages of the invention will become apparent during the course of the following description.

the same, a

Fig. 1 is a diagrammaticvie'w of aplate glass surfacing machine,

' Fig. 2 isa fragjm entary section through a portion of theta le, I

- positioned Fig. 3 is a vertical' transverse section through the table showing the protective pad having the same dimensions as the sheet reof the construc- OFFICE be operated through means of the drive shaft 14}. The axis of the surfacing tool is prefer- "ably offset from theaxis of the-- table, al-

though both axes may be in-alignment while the grinding or polishing tools are carried upon radiating arms;

. The table 10 has of the screw arrangement 16. A stud 17 is provided with a head 18 adapted to run in the guide-way 19 to prevent accidental dis adjustably associated therewithplates15 adjustable throughmea'ns placement of the plates 15 when in use. The

inner edges of the plates 15 arelprovided with removable'strips 20 having the protective surfaces 21 thereon.

The four plates 15 which the sheet 12 may be positioned during the surfacing operations. I As is shown in they l;

the recess is slightly larger than drawings, the sheet of glass being surfaced so that the sheet is free to move within the recess during the grinding and polishing operations.

. define a recess 22 in v In order that the surfaces of the sheet will be parallel to each other-the bottomof the recessis so formed that it will produce a master surface which will the-plate'of glass'being ground. To prevent injury to the underside of the sheet While within the recess, a pad of felt 23 is interposed between the sheet of glass and the bottom of the recess. The felt is of substantially the same thickness throughout its enthe width, although because of -its nature it will adapt itself to permit the sheet to be be reproduced upon squarely within the recess. A1

though felt is mentioned, any similar material can be used. The felt pad is not in any way cemented or fastened within the recess, being placed loosely therein, and as shown in Fig. 4 is permitted to move around within the recess as does the sheet. In Figs. 2 and 3, the felt pad is substantially the same size as the recess so that the amount of movement will be negligible during the surfacing operations. However, by means of the adjustable plates 15, the size of the recess 22 can be regulated as desired so that the lateral movement of the pad 23 can be increased or decreased as preferred. It has been found in actual use that the felt pad does not ball up or wrinkle when loosely mounted Within the recess, and in fact a very satisfactory plate of glass is produced When the felt pad is supported within the .recess in this manner.

It is to be understood invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be restorted to without departing from the spirit of the invention or the scope of the subjoined claim.

I claim:

In sheet glass surfacing apparatus a table having a sheet receiving recess therein, and a pad loosely mounted within the recess for freely supporting the sheet of glass to be surfaced, said recess being of a shape to prevent turning of the pad and sheet there- 1n.

Signed at Toledo, in the county of Lucas,

' and State of Ohio, this 20th day of June,

JOHN G. GIPE.

that the form of the v I 

